EXO Val Dev backported to 72X

The idea is to backport #5320 (originally from @ndaci, and merged in 73X since two weeks already) in 72X.
This PR would allow monitoring also in 72X a set of paths from Exotica included in the Run2 HLT menu.
Of course, I let @deguio and the release managers to decide about it. But I think it  would be a pity not being able of monitoring those HLT paths in 72X, when the PR exists in 73X and it is now ready also for 72X.